Military action
The Empire of Order had enough of the Crimsonites and struck them first, their first attack was a surprise attack on Cryos where they will bombard the planet with Apocalypse Weapons and pick off the survivors.
The Imperial attack went well at first, the planet's surface was reduced to ash and lava but the survivors were more resilient than expected and the Imperial Fleet had to move on to the front line after 3 years of raids.
A new faction was formed by the survivors of the Siege, the Free Cryos Militia, formed to defend Cryos from the Imperials and rebuild their once great world.